Hello. Thank you for using PetCoach.
This food is the best for pregnant/breeding/nursing rats:
(
https://www.animates.co.nz/vetafarm-origins-rodent-food-350g.html )
You can offer small amounts of fruit and vegetables (such as: apples,
bananas, peas, broccoli, sprouts and carrots). Cooked egg, cooked
chicken and cooked pasta are also fine to give.
If she is being a good mother you should not have to do anything to feed the pups. By about 3 weeks of age they are fully developed and will start eating solid food, though they are still being fed by their mother for about another week.
Remember, after 4 to 4.5 weeks, the males should be separated from the rest of the pups and mom since they could impregnate their mother.
Hope this helps. Best wishes.